This part of IEC 61207 applies to all aspects of analyzers utilizing TSLAS for the concentration measurement of one or more gas components in a gaseous mixture or vapour. It applies to analyzers utilizing tuneable semiconductor lasers as sources and utilizing absorption spectroscopy@ such as direct absorption@ FMS@ WMS@ multi-pass absorption spectroscopy@ CRDS@ ICOS@ PAS and CEAS techniques@ etc. It applies both to in situ or extractive type analyzers. This standard includes the following@ it ?C specifies the terms and definitions related to the functional performance of gas analyzers@ utilizing tuneable semiconductor laser gas absorption spectroscopy@ for the continuous measurement of gas or vapour concentration in a source gas@ ?C unifies methods used in making and verifying statements on the functional performance of this type of analyzers@ ?Cspecifies the type of tests to be performed to determine the functional performance and how to carry out these tests@ ?C provides basic documents to support the application of the standards of quality assurance with in ISO 9001